Buggy code:
public class Facade { private GameModel game ; private IProxy proxy ; private ArrayList < Observer > observers = new ArrayList < Observer > ( ) ; private boolean loggedIn = false ; private boolean Joined = false ; private boolean Created = false ; private boolean ready = false ; private static Facade facade = new Facade ( ) ; private Facade ( ) { } public static Facade getInstance ( ) { } public PlayerInfo getCurrentPlayerInfo ( ) { } public int getGameIndex ( ) { } public void setProxy ( IProxy proxy ) { } public void retrieveGameModel ( ) { <START_BUG> if ( ! ( loggedIn ) ) <END_BUG> return ; GameModel gm = proxy . getGameModel ( ) ; if ( gm != null ) { System . out . println ( gm . getTurnTracker ( ) . getStatus ( ) ) ; game = gm ; for ( int i = 0 ; i < ( observers . size ( ) ) ; i ++ ) observers . get ( i ) . update ( game , "" ) ; } } public CurrentPlayer getCurrentPlayer ( ) { } public CurrentResources getCurrentResources ( ) { } public int getPlayerID ( ) { } public int getPlayerIndex ( ) { } public GameModel getGameModel ( ) { } public void Reinitialize ( GameModel g ) { } public void addObserver ( Observer x ) { } public void setReady ( ) { } public CatanColor getCatanColor ( ) { } public Map getMap ( ) { } public CatanColor getPlayerColor ( int player ) { } public boolean playerLogin ( String username , String password ) { } public boolean register ( String username , String password ) { } public List < GameInfo > gamesList ( ) { } public int getPoints ( int playerIndex ) { } public void gamesCreate ( CreateGamePassObject gameNew ) { } public void gameAddAI ( ) { } public void gamesJoin ( String s , int gameId ) { } public boolean canBuildRoad ( int playerId ) { } public boolean canPlaceRoad ( EdgeLocation el , boolean isDisconnected ) { } public boolean canPlaceRoadSetup ( EdgeLocation el ) { } public void PlaceRoadSetup ( EdgeLocation el ) { } public void placeRoad ( int pid , EdgeLocation el , boolean free , boolean isDisconnected ) { } public boolean canBuildSettlement ( int pid ) { } public boolean canPlaceSettlement ( VertexLocation vl ) { } public void placeSettlement ( int pid , VertexLocation vl , boolean free ) { } public boolean canBuildCity ( int pid ) { } public boolean canPlaceCity ( VertexLocation vl ) { } public void placeCity ( int pid , VertexLocation vl ) { } public boolean canRoadBuilding ( int pid ) { } public void playRoadBuilding ( int pid , EdgeLocation el1 , EdgeLocation el2 ) { } public boolean canUseMonument ( int pid ) { } public void playMonument ( int pid ) { } public boolean canYearOfPlenty ( int pid ) { } public void playYearOfPlenty ( int pid , ResourceType r , ResourceType r1 ) { } public boolean canPlaySoldier ( int pid ) { } public void playSoldier ( int pid , int vid , HexLocation hl ) throws IllegalMoveException { } public boolean canRob ( int pid , int vid ) { } public boolean canMoveRobber ( HexLocation hl ) { } public void rob ( int pid , int vid , HexLocation hl ) { } public boolean canTradeBank ( int pid , ResourceList rl ) { } public void meritimeTrade ( int playerId , int ratio , ResourceType in , ResourceType out ) { } public boolean canRoll ( int pid ) { } public void roll ( int pid , int number ) { } public boolean canFinishTurn ( int pid ) { } public void FinishTurn ( int pIndex ) { } public boolean canDiscardCards ( int pid , ResourceList rl ) { } public void DiscardCards ( int pid , ResourceList rl ) { } public boolean canBuyDevcard ( int pid ) { } public void buyDevCard ( int pid ) { } public boolean canMonopoly ( int pid ) { } public void playMonopoly ( int pid , ResourceType r ) { } public boolean canTradePlayer ( int pid , int rid , ResourceList rl ) { } public void tradePlayer ( int playerIndex , int rid , ResourceList rl ) { } public boolean canAcceptTrade ( int pid , int vid , ResourceList offer ) { } public void acceptTrade ( int pid , boolean acceptance ) { } public boolean canWin ( ) { } public boolean canSendChat ( String msg , int pid ) { } }

Fix:
if ( ( ( ! ( loggedIn ) ) || ( ! ( Joined ) ) ) || ( ! ( ready ) ) )